53506121 has 4 divisors (see below), whose sum is σ = 53522052. Its totient is φ = 53490192.

The previous prime is 53506091. The next prime is 53506127. The reversal of 53506121 is 12160535.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 21752896 + 31753225 = 4664^2 + 5635^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-53506121 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (53506127) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 746 + ... + 10371.

It is an arithmetic number, because the mean of its divisors is an integer number (13380513).

Almost surely, 2^53506121 is an apocalyptic number.

It is an amenable number.

53506121 is a deficient number, since it is larger than the sum of its proper divisors (15931).

53506121 is a wasteful number, since it uses less digits than its factorization.

53506121 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15930.

The product of its (nonzero) digits is 900, while the sum is 23.

The square root of 53506121 is about 7314.7878301424. The cubic root of 53506121 is about 376.8204719029.

Adding to 53506121 its reverse (12160535), we get a palindrome (65666656).

The spelling of 53506121 in words is "fifty-three million, five hundred six thousand, one hundred twenty-one".